Tabla de Contenidos
Pascals = atmospheres x 101.325
The atmosphere was originally defined as the pressure of 760 millimeters of mercury in standard gravity at 0ºC. Atmospheres can be abbreviated as atm; for example, one atmosphere can be written as 1 atm .
The pascal is defined as the pressure of one newton per square meter. The pascal is the derived unit in the International System (SI) for pressure in the metric system. Pascals can be abbreviated as Pa; for example, 1 pascal can be written as 1 Pa.
Pascals can be expressed using the formula:
1 Pa = 1 Newton/m 2
Pressure in pascals is equal to force in newtons divided by area in meters squared.
Pressure units in chemistry, conversions and examples
The three most commonly used units of pressure in chemistry are:
- atmospheres (atm)
- millimeters of mercury (mmHg)
- Pascals (Pa) or kilopascals (kPa)
Conversion from atmospheres to millimeters of mercury
1 atmosphere corresponds to 760 mmHg, so if we have 0.875 atmospheres they will become:
0.875 atm · ( 760 mmHg/ 1 atm) = 665 mmHg
To go from millimeters of mercury to atmospheres, for example, if we have 745 mmHg to go to atmospheres, divide the value by 760 mmHg.
(745mmHg)/(760mmHg) = 0.980 atm
Conversion between atmospheres and kilopascals
1 atmosphere is equal to 101.325 kPa, so it will be multiplied or divided based on the change.
For example, if we have 0.955 atmospheres, to convert it to kPa, we could do:
0.955 atm · (101.325 kPa /1 atm) = 96.8 atm
In the same way that if we have 98.35 kPa, to pass it to atmospheres, it can be done:
98.35 kPa / (101.325 kPa / atm) = 0.9706 atm
Conversion between millimeters of mercury and kilopascals
760 mm Hg correspond to 101.325 kPa, so both values must be taken into account to take into account the conversions.
If we want to pass 740 mmHg to kPa, it would be highlighted:
740 mmHg (101.325 kPa/ 760 mmHg) = 98.66 atm
If we want to convert 99.25 kPa to mmHg:
99.25 kPa · (760 mm Hg / 101.325 kPa) = 744.4 mm Hg
Sources
- Wight Hat Ltd. (2021). Atmospheres to Pascals conversion. Retrieved 14 April 2021, from https://www.metric-conversions.org/pressure/atmospheres-to-pascals.htm
- Convert physical atmospheres to pascals – pressure converter. (2021). Retrieved 14 April 2021, from https://www.unitjuggler.com/convert-pressure-from-atm-to-Pa.html
- Converting between Units of Pressure: atm, mmHg and kPa. (2021). Retrieved 14 April 2021, from https://www.chemteam.info/GasLaw/PressureConversions.html
 for pressure in the metric system.){kind=link}